Post Views: 180 If you work with VoIP, and more specifically SIP long enough, eventually you find yourself staring at an INVITE, a handful of provisional responses, several IP addresses, a 200 OK, an ACK, and perhaps a BYE—and trying to mentally reconstruct what actually happened. Wireshark can certainly do this. In fact, Wireshark remains
sngrep: The SIP Troubleshooting Tool You Should Know Read More »
Post Views: 2,639 Hi everyone! As many of you who have attended my conference presentations and Wi-Fi classes know, I spend time talking about the correct way of troubleshooting Wi-Fi networks. **********JUST UPDATED************* Power cycling or rebooting is NOT a first step. Here’s why: lets say you are having issues of some kind (slow speed,
Our Comprehensive Wi-Fi Troubleshooting Guide Read More »
Post Views: 538 Do not troubleshoot Wireshark captures by chasing random red and black packets. Start with triage, classify the traffic, branch into the correct protocol workflow, and then prove the finding with packet evidence. The following is a shortened version of our structured “Triage → Classify → Branch → Prove” Wireshark troubleshooting workflow built
Wireshark Troubleshooting Workflow Read More »
Post Views: 36,935 2-Day Instructor-Led Hands-On Lab CourseAvailable through Web-Based Live Delivery or On-Site DeliveryMinimum 10 Students – Maximum 16 Students What Students are saying about this class Course Description Wireshark is one of the most powerful tools available to network technicians, engineers, administrators, and support professionals—but capturing packets is only the beginning. The real
CSI-HO-020-A – Explore Packet Analysis with Wireshark Standard Edition – 2 Day Read More »
Post Views: 10,093 Here’s a solid toolbox of Windows PowerShell commands used for network troubleshooting, with quick notes on what each one is good for. I’ll try to group them by task so they are a little easier to remember. 1. Basic Connectivity & “Ping-Style” Tests Test-Connection PowerShell’s ping (ICMP echo) equivalent. Test-NetConnection More advanced
PowerShell Commands Used for Network Troubleshooting Read More »
Post Views: 13,084 1-Day Instructor-Led CourseWeb-Based Delivery or Self-Paced OnlineMinimum: 10 StudentsWeb Based Delivery: Max class size is 30On Site Delivery: Max class size is 20 Stop Guessing. Start Troubleshooting Systematically. When a customer says, “The network isn’t working,” where do you start? Good network troubleshooting is not about randomly changing settings, rebooting devices, or
CSI-SP-008 – Network Troubleshooting Fundamentals for Technicians – 1D Read More »
Post Views: 3,097 Here are several VoIP troubleshooting checklists and tools, organized by focus area to help quickly identify and resolve common issues. These checklists are especially useful for IT admins, NOC teams, and VoIP engineers. Are they “the bees knees” of troubleshooting VoIP? No. In fact, if you have feedback or comments on improving
Some VoIP Troubleshooting Checklists and Tools Read More »
Post Views: 2,771 PJSIP is a free, open-source multimedia communication library written in C that is used for troubleshooting VoIP. PJSIP implements standard-based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE, targeting VoIP (Voice over IP) applications, including SIP signaling and media handling. You will find the project at github here. What Is
VoIP Troubleshooting with PJSIP Read More »
Post Views: 3,452 This article discusses what SIP pings are, and how to use them in troubleshooting VoIP (Voice over IP) networking. A SIP ping in VoIP is a diagnostic method used to check the availability and responsiveness of a SIP (Session Initiation Protocol) server or endpoint. It’s similar in concept to an ICMP ping,
What are and how to use SIP Pings in VoIP Read More »
Post Views: 7,844 When testing the Internet, there are several key tools we use in troubleshooting: one of them is ping. To verify a particular IP address is operational we “ping 192.168.0.1” from the command line to see if we get an answer back, letting us know that the system we are pinging and the
SIP Testing and Troubleshooting with sipsak Read More »
Post Views: 1,608 At our Online School of Network Science, we have created a Network Scientist Tool Belt. This completely free resource is available for you to access, learn and add software and hardware tools to troubleshoot todays networks. You will just need to set up a free account, and the link will get you
The Network Scientists Tool Belt Read More »
Post Views: 7,080 As QUIC has emerged to begin its takeover of the Transport Layer (OK – we will never see TCP totally disappear), I have written multiple articles on QUIC. You can look them over here. In the early days Google made this really easy right within the Chrome web browser. As time has
Troubleshooting QUIC Traffic – Not Easy Read More »
Post Views: 3,022 Let’s start with some simple definitions of these protocols and how they work together. In Voice over IP (VoIP) to PSTN (telephone) network integration, MGCP and C15 can work together as part of a layered signaling architecture that bridges IP-based call control with traditional PSTN switching systems. Here’s how they fit and
Troubleshooting C15 and MGCP Protocols for VoIP Read More »
Post Views: 2,191 A recent discussion with several colleagues led to a discussion on how AI can be leveraged in the world of internetworking. With all the hype around AI, some pretty crazy things are being claimed by vendors, but looking under the surface requires specific solutions and, frankly, things become very vendor specific very
How can AI be used in Networking? Read More »
Post Views: 5,179 Retransmissions of frames in WLANs (Wireless Local Area Networks) can become problematic for several reasons, primarily due to the nature of the wireless medium. While retransmissions are a necessary part of ensuring data integrity in unreliable networks, they can cause inefficiencies and degrade network performance. I will get to the details below,
Recognizing WLAN Retransmissions is a Critical Skill Read More »
